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change default size of CDC/ACM serial buffer sizes

This commit is contained in:
Gregory Nutt 2015-12-07 17:18:14 -06:00
parent 8fdb173090
commit 513cc08c7f
1 changed files with 18 additions and 10 deletions
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28
drivers/usbdev/Kconfig
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@ -244,6 +244,10 @@ config PL2303_BULKIN_REQLEN
on the other hand, request buffer size is always the same as the on the other hand, request buffer size is always the same as the
maxpacket size. maxpacket size.
There is also no reason from PL2303_BULKIN_REQLEN to be greater
than PL2303_TXBUFSIZE-1, since a request larger than the TX
buffer can never be sent.
config PL2303_RXBUFSIZE config PL2303_RXBUFSIZE
int "Receive buffer size" int "Receive buffer size"
default 513 if USBDEV_DUALSPEED default 513 if USBDEV_DUALSPEED
@ -257,14 +261,14 @@ config PL2303_RXBUFSIZE
config PL2303_TXBUFSIZE config PL2303_TXBUFSIZE
int "Transmit buffer size" int "Transmit buffer size"
default 513 if USBDEV_DUALSPEED default 767 if USBDEV_DUALSPEED
default 257 if !USBDEV_DUALSPEED default 193 if !USBDEV_DUALSPEED
---help--- ---help---
Size of the serial transmit buffers. The actual amount of data that Size of the serial transmit buffers. The actual amount of data that
can be held in the buffer is this number minus one due to the way can be held in the buffer is this number minus one due to the way
that the circular buffer is managed. So a TX buffer size of 257 that the circular buffer is managed. So a TX buffer size of 767
will hold four full-speed, 64 byte packets; a buffer size of 513 will hold one request of size 768; a buffer size of 193 will hold
will hold one high-speed, 512 byte packet. two requests of size 96 bytes.
config PL2303_VENDORID config PL2303_VENDORID
hex "Vendor ID" hex "Vendor ID"
@ -429,6 +433,10 @@ config CDCACM_BULKIN_REQLEN
on the other hand, request buffer size is always the same as the on the other hand, request buffer size is always the same as the
maxpacket size. maxpacket size.
There is also no reason from CDCACM_BULKIN_REQLEN to be greater
than CDCACM_TXBUFSIZE-1, since a request larger than the TX
buffer can never be sent.
config CDCACM_RXBUFSIZE config CDCACM_RXBUFSIZE
int "Receive buffer size" int "Receive buffer size"
default 513 if USBDEV_DUALSPEED default 513 if USBDEV_DUALSPEED
@ -442,14 +450,14 @@ config CDCACM_RXBUFSIZE
config CDCACM_TXBUFSIZE config CDCACM_TXBUFSIZE
int "Transmit buffer size" int "Transmit buffer size"
default 513 if USBDEV_DUALSPEED default 767 if USBDEV_DUALSPEED
default 257 if !USBDEV_DUALSPEED default 193 if !USBDEV_DUALSPEED
---help--- ---help---
Size of the serial transmit buffers. The actual amount of data that Size of the serial transmit buffers. The actual amount of data that
can be held in the buffer is this number minus one due to the way can be held in the buffer is this number minus one due to the way
that the circular buffer is managed. So a TX buffer size of 257 that the circular buffer is managed. So a TX buffer size of 767
will hold four full-speed, 64 byte packets; a buffer size of 513 will hold one request of size 768; a buffer size of 193 will hold
will hold one high-speed, 512 byte packet. two requests of size 96 bytes.
config CDCACM_VENDORID config CDCACM_VENDORID
hex "Vendor ID" hex "Vendor ID"